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common GM issue, faulty wiper motor. buy another and either get a repair manual or search for a video on youtube of someone replacing their GM wiper motor. you will have to remove the linkage, swap the motor, then reinstall the linkage. be extra careful to make sure the wiper switch is in OFF position before you begin and to note the OFF position on the linkage as you reinstall the motor.
try this fix
remove wiper arms from where they connect on car
turn wiper moter on then off. turn ignition off
if wiper motor is good it should put spline in off position and now all you need to do is replace wiper arms in the correct position they would be in when wipers are turned off
most likely the relays inside your windshield wiper motor are starting to go. if your mechanically inclined you can probably go to your local junkyard and pull another one from the same car. i know they run about 75 new from most auto stores. to remove the old one you need to remove the dust cover underneath the windshiel wiper arms (easier with hood open). they should be small phillips screws or they are going to be push button clips (if they are clips just pry them out, you might need to replace them because some of them might break when removing). once you have the dust cover removed, disconnect the wiper arm linkage to the motor. then from inside the engine compartment remove the mounting bolts for the motor itself, don't forget the electrical connector. installation is the reverse of removal.
I had the same problem in my LW200. As the other poster indicated a new wiper motor will do the trick. This is an easy fix. Remove the wiper arms, pry up the plastic center cap and remove the nuts holding the arms down then pull them off. A soft prying nudge from underneath will help as they are splined shafts. Raise the hood, put a large deep well socket on over the splined shafts and remove the 2 large nuts holding the trim panel on. Pull up and off the long rubber which runs along the front of the trim panel, watch there is a sharp edge underneath. Now you can gently pull off the trim panel, remembering to lift it over the splined shafts. Mechanism is right there, remove 3 screws and unplug wiring. Take wiper motor off the linkage swap with a new one at advance auto, about 100 bucks, reinstall in reverse order. Note there is a stamping on the linkage telling you where the pivot arm should be for the rest or stopped position and if you ignore that your wipers will be out of whack. While you are in there you may want to change the cabin air filter as well.
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